<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>Document</title>
    <style>
        .box1{
            width: 200px;
            height: 100px;
            background-color: #bfa;
            float: left;
        }
        .box2{
            width:200px;
            height:100px;
            background-color: orange;
            float: left;
        }
        .box3{
            width: 100px;
            height: 100px;
            background-color: blue;
            float: right;
        }
    </style>
</head>
<body>
    <div class="box1">

    </div>  
    <div class="box3">

    </div>  
    <div class="box2">

    </div>  
   
</body>
</html>